<!DOCTYPE html>
<html>
	<head>
		<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
		<title>验证码</title>
		<script class="jquery library" src="/js/sandbox/jquery/jquery-1.8.2.min.js" type="text/javascript"></script>
		<script type="text/javascript">
			!(function(window, document) {
				function GVerify(options) { //创建一个图形验证码对象，接收options对象为参数
					this.options = { //默认options参数值
						id: "", //容器Id
						canvasId: "verifyCanvas", //canvas的ID
						width: "100", //默认canvas宽度
						height: "30", //默认canvas高度
						type: "blend", //图形验证码默认类型blend:数字字母混合类型、number:纯数字、letter:纯字母
						code: ""
					}

					if (Object.prototype.toString.call(options) == "[object Object]") { //判断传入参数类型
						for (var i in options) { //根据传入的参数，修改默认参数值
							this.options[i] = options[i];
						}
					} else {
						this.options.id = options;
					}

					this.options.numArr = "0,1,2,3,4,5,6,7,8,9".split(",");
					this.options.letterArr = getAllLetter();

					this._init();
					this.refresh();
				}

				GVerify.prototype = {
					/**版本号**/
					version: '1.0.0',

					/**初始化方法**/
					_init: function() {
						var con = document.getElementById(this.options.id);
						var canvas = document.createElement("canvas");
						this.options.width = con.offsetWidth > 0 ? con.offsetWidth : "100";
						this.options.height = con.offsetHeight > 0 ? con.offsetHeight : "30";
						canvas.id = this.options.canvasId;
						canvas.width = this.options.width;
						canvas.height = this.options.height;
						canvas.style.cursor = "pointer";
						canvas.innerHTML = "您的浏览器版本不支持canvas";
						con.appendChild(canvas);
						var parent = this;
						canvas.onclick = function() {
							parent.refresh();
						}
					},

					/**生成验证码**/
					refresh: function() {
						this.options.code = "";
						var canvas = document.getElementById(this.options.canvasId);
						if (canvas.getContext) {
							var ctx = canvas.getContext('2d');
						} else {
							return;
						}

						ctx.textBaseline = "middle";

						ctx.fillStyle = randomColor(180, 240);
						ctx.fillRect(0, 0, this.options.width, this.options.height);

						if (this.options.type == "blend") { //判断验证码类型
							var txtArr = this.options.numArr.concat(this.options.letterArr);
						} else if (this.options.type == "number") {
							var txtArr = this.options.numArr;
						} else {
							var txtArr = this.options.letterArr;
						}

						for (var i = 1; i <= 4; i++) {
							var txt = txtArr[randomNum(0, txtArr.length)];
							this.options.code += txt;
							ctx.font = randomNum(this.options.height / 2, this.options.height) + 'px SimHei'; //随机生成字体大小
							ctx.fillStyle = randomColor(50, 160); //随机生成字体颜色        
							ctx.shadowOffsetX = randomNum(-3, 3);
							ctx.shadowOffsetY = randomNum(-3, 3);
							ctx.shadowBlur = randomNum(-3, 3);
							ctx.shadowColor = "rgba(0, 0, 0, 0.3)";
							var x = this.options.width / 5 * i;
							var y = this.options.height / 2;
							var deg = randomNum(-30, 30);
							/**设置旋转角度和坐标原点**/
							ctx.translate(x, y);
							ctx.rotate(deg * Math.PI / 180);
							ctx.fillText(txt, 0, 0);
							/**恢复旋转角度和坐标原点**/
							ctx.rotate(-deg * Math.PI / 180);
							ctx.translate(-x, -y);
						}
						/**绘制干扰线**/
						for (var i = 0; i < 4; i++) {
							ctx.strokeStyle = randomColor(40, 180);
							ctx.beginPath();
							ctx.moveTo(randomNum(0, this.options.width), randomNum(0, this.options.height));
							ctx.lineTo(randomNum(0, this.options.width), randomNum(0, this.options.height));
							ctx.stroke();
						}
						/**绘制干扰点**/
						for (var i = 0; i < this.options.width / 4; i++) {
							ctx.fillStyle = randomColor(0, 255);
							ctx.beginPath();
							ctx.arc(randomNum(0, this.options.width), randomNum(0, this.options.height), 1, 0, 2 * Math.PI);
							ctx.fill();
						}
					},

					/**验证验证码**/
					validate: function(code) {
						var code = code.toLowerCase();
						var v_code = this.options.code.toLowerCase();
						console.log(v_code);
						if (code == v_code) {
							return true;
						} else {
							this.refresh();
							return false;
						}
					}
				}
				/**生成字母数组**/
				function getAllLetter() {
					var letterStr =
						"a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z,A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,V,W,X,Y,Z";
					return letterStr.split(",");
				}
				/**生成一个随机数**/
				function randomNum(min, max) {
					return Math.floor(Math.random() * (max - min) + min);
				}
				/**生成一个随机色**/
				function randomColor(min, max) {
					var r = randomNum(min, max);
					var g = randomNum(min, max);
					var b = randomNum(min, max);
					return "rgb(" + r + "," + g + "," + b + ")";
				}
				window.GVerify = GVerify;
			})(window, document);
		</script>
		<script src="https://cdn.staticfile.org/jquery/2.2.4/jquery.min.js"></script>
		<title>RunJS 演示代码</title>
	</head>
	<body>
		<div id="v_container" style="width: 200px;height: 50px;"></div>
		<input type="text" id="code_input" value="" placeholder="请输入验证码" /><button id="my_button">验证</button>

		<script>
			var verifyCode = new GVerify("v_container");
			document.getElementById("my_button").onclick = function() {
				var res = verifyCode.validate(document.getElementById("code_input").value);
				if (res) {
					alert("验证正确");
				} else {
					alert("验证码错误");
				}
			}
		</script>
	</body>
</html>
